Nobody can answer that exact question. The IRS can do just about anything it wants. Then again the IRS has roughly 700 million tax returns (resident, foreign, business, trusts, etc) to process and verify every year. Plus they need to track down tens of millions of delinquent tax payers owning trillions of dollars collectively. Add to that the filing and responding to hundreds of thousands of lawsuits each year and you can imagine they got a lot to do.
The simple solution is to just pay the taxes. Not sure what you are doing (and honestly I don't want to know, seriously) but the IRS doesn't care if your business is unlawful as long as you pay your "fair" share.
Still in all honesty your $30,000 per year is "chump change". I mean if your marginal tax rate is 15% we are talking about $4,500 in additional taxes. If you make less than $100K per year the odds of you being a target of an audit (due to return being flagged) is essentially 0%. Now in addition to targeted audits the IRS does randomly audit about 1% of all tax returns. If you are audited due to bad luck in theory they could pull your PayPal (and other financial) records and ask you to explain.
Simple version:
The lower your income the less likely the IRS is going to look. You don't have as much ability to pay, you likely have less assets they can use as leverage, and the amount you can evade is directly related to your income. Catching one $10 mill tax evader has a higher ROI% than trying to track down 2,000 people who evaded $5,000 in taxes.